Prevent from displaying broken page

The commit adds an error listener which will replace the document body
with an error message if any of the files required for the app to
be displayed correctly fails to load.

Xcode insists on automatically fixing the project file with tvOS
support. In order to not have to constantly ignore these automatic
changes when committing, commit them.

New tooltip for contact list

audio_level oppacity and addParticipant button name

Update _variables.scss

Adjust alignment of remote video menu

fix(Toolbar): Both toolbars are displayed in the same time

fix(Thubmnail_PopupMenu): the thumbnail should be considered hovered when the popup menu is hovered

Add detect translation freeze in interface config

Ongoing work video thumbnails

We now just hide the icon with values and show the interrupted one. Calling this one was causing troubles like flickering and stats popover not able to hide, once shown. On hover we are calling updateView which ends to this call which destroy and create the popover, which maybe is leading to this problems.

Do not display avatar on top of the connection problem messages

Previously the z-index was introduced in order to have the avatar
visible on top of the black video element, but now we're always hiding
the video element when the avatar is displayed, so it's no longer
required.

In small video we use UIUtil.setVisibility, so we should not use jquery show/hide for the same element.

Make the stop recording dialog work again